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TDA7501 Scheda tecnica(PDF) 5 Page - STMicroelectronics |
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TDA7501 Scheda tecnica(HTML) 5 Page - STMicroelectronics |
5 / 18 page DESCRIPTION OF THE INPUT PART On the input side, the DSPLD (see figure 1) con- nects the external audio- and tuner-signals to the four AD-converters of the Digital Carradio Signal Processor TDA7500. The audio signals are ad- justed by the input gain stage to the internal refer- ence signal with 2V rms referred to 4.15V (=V33 Ã 1.2575). The following CODEC-interface at- tenuates the 2Vrms to 0.8Vrms referred to the CODEC’s reference voltage of 1.65V which al- lows a DC-coupling to the TDA7500. Figure 1. Input part. Input Stages The decive offers several input stages for the dif- ferent signals which have to be handled by the system. A quasi differential input (see figure 2) can be used for (external) CD-changer. The two mono differential inputs allow the connection of Phone and Navigation (see figure 3) or it could be used as fully differential stereo input. Additionally a single-ended stereo input is available for Cas- sette applications. The lower part of the input section is dedicated to the tuner signals. Another quasi differential input (see figure 4) is used to connect AM and FM referred to the tuner refer- ence (Tuner-). This concept supports also double tuner systems. Also two seperate level inputs are present which are followed by level-shifters to al- low the use of the TDA7500’s ADCs. For AM noise blanking an envelope-detector driven by the AM-IF is also available. TDA7501 5/18 |
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